Remove wchar/wstring version of StringPrintf.

base/stringprintf.h

Index: base/stringprintf.h
diff --git a/base/stringprintf.h b/base/stringprintf.h
index 40ad107aead14fd3af62aeafb63f6aae21ac861a..9c5504c8f43ad921c0cc1fded881df3c05f93c08 100644
--- a/base/stringprintf.h
+++ b/base/stringprintf.h
@@ -17,8 +17,6 @@ namespace base {
 // Return a C++ string given printf-like input.
 BASE_EXPORT std::string StringPrintf(const char* format, ...)
     PRINTF_FORMAT(1, 2);
-BASE_EXPORT std::wstring StringPrintf(const wchar_t* format, ...)
-    WPRINTF_FORMAT(1, 2);
 
 // Return a C++ string given vprintf-like input.
 BASE_EXPORT std::string StringPrintV(const char* format, va_list ap)
@@ -28,25 +26,15 @@ BASE_EXPORT std::string StringPrintV(const char* format, va_list ap)
 BASE_EXPORT const std::string& SStringPrintf(std::string* dst,
                                              const char* format, ...)
     PRINTF_FORMAT(2, 3);
-BASE_EXPORT const std::wstring& SStringPrintf(std::wstring* dst,
-                                              const wchar_t* format, ...)
-    WPRINTF_FORMAT(2, 3);
 
 // Append result to a supplied string.
 BASE_EXPORT void StringAppendF(std::string* dst, const char* format, ...)
     PRINTF_FORMAT(2, 3);
-// TODO(evanm): this is only used in a few places in the code;
-// replace with string16 version.
-BASE_EXPORT void StringAppendF(std::wstring* dst, const wchar_t* format, ...)
-    WPRINTF_FORMAT(2, 3);
 
 // Lower-level routine that takes a va_list and appends to a specified
 // string.  All other routines are just convenience wrappers around it.
 BASE_EXPORT void StringAppendV(std::string* dst, const char* format, va_list ap)
     PRINTF_FORMAT(2, 0);
-BASE_EXPORT void StringAppendV(std::wstring* dst,
-                               const wchar_t* format, va_list ap)
-    WPRINTF_FORMAT(2, 0);
 
 }  // namespace base